function Student(sname,sage){
  this.sname=sname;
  this.sage=sage;
}
Student.prototype.intr=function(){
  console.log("I'm "+this.sname+", I'm "+this.sage);
}
var lilei=new Student("Li Lei",11);
var hmm=new Student("Han Meimei",12);
console.log(lilei);
lilei.intr();
console.log(hmm);
hmm.intr();